How to Access 64-bit Registry Keys from a 32-bit .NET Application?
Jan 16, 2025 pm 07:16 PM
Accessing 64-bit Registry Entries from a 32-bit .NET Application
Accessing the 64-bit registry from a 32-bit application running on a 64-bit Windows system requires a specific approach. Fortunately, the .NET Framework 4.x and later versions offer built-in support for this.
Leveraging RegistryView for 64-bit Registry Access
The RegistryView enumeration is key to differentiating between 32-bit and 64-bit registry access. Here's how to use it:
// Access the 64-bit registry using Microsoft.Win32; RegistryKey localKey64 = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64); RegistryKey sqlServerKey64 = localKey64.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL"); // Access the 32-bit registry RegistryKey localKey32 = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32); RegistryKey sqlServerKey32 = localKey32.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL");
Retrieving Specific Registry Values
To retrieve a specific value, such as "SQLEXPRESS" under the "Instance NamesSQL" key, use:
string sqlExpressKeyName = (string)sqlServerKey64.GetValue("SQLEXPRESS");
Comprehensive Key Retrieval: Combining 32-bit and 64-bit Results
For situations needing data from both 32-bit and 64-bit registry locations, a combined query is beneficial:
using System.Linq;
IEnumerable<string> GetAllRegValueNames(string regPath)
{
var reg64 = GetRegValueNames(RegistryView.Registry64, regPath);
var reg32 = GetRegValueNames(RegistryView.Registry32, regPath);
var result = (reg64 != null && reg32 != null) ? reg64.Union(reg32) : (reg64 ?? reg32);
return (result ?? new List<string>().AsEnumerable()).OrderBy(x => x);
}
Where GetRegValueNames is a helper function (not shown, but easily implemented) that retrieves value names under a given key. regPath specifies the registry path.
Example usage:
var sqlRegPath = @"SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL";
foreach (var keyName in GetAllRegValueNames(sqlRegPath))
{
Console.WriteLine(keyName);
}
``` This iterates through all found keys, regardless of whether they reside in the 32-bit or 64-bit registry hive.The above is the detailed content of How to Access 64-bit Registry Keys from a 32-bit .NET Application?. For more information, please follow other related articles on the PHP Chinese website!
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